Tracked live by the FAA, but its flight plan was first seen after takeoff, so we don't know the scheduled time and can't say whether it's late.

UNITED · FLIGHT UA 311 LANDED 11:37 AM ET, ~23 MIN EARLY · SCHEDULED TIME UNKNOWN
Yesterday

UA 311 · DUB → IAD

took off 8:58 AM IST · landed 11:37 AM ET (scheduled time unknown)
Forecast issued Sat 10:00 PM ET · 18h after departure

Odds over time

Arrive at IAD more than 15 minutes late?
7% chance · ±0 pts +0 pts · 24h
HOW SURE WE ARE Very high. The odds now come almost entirely from live conditions.
LIVE IN THE AIR 0% 3% 6% 9% 12% 1h Departs Lands